[PATCH v5 3/6] mtd: spi-nor: add spi_nor_init() function

[Cyrille Pitchen]

Le 23/03/2017 à 00:33, Cyrille Pitchen a écrit :
> This patch extracts some chunks from spi_nor_scan() and moves them into
> a new spi_nor_init() function.
> 
> Indeed, spi_nor_init() regroups all the required SPI flash commands to be
> sent to the SPI flash memory before performing any runtime operations
> (Fast Read, Page Program, Sector Erase, ...). Hence spi_nor_init():
> 1) removes the flash protection if applicable for certain vendors.
> 2) sets the Quad Enable bit, if needed, before using Quad SPI protocols.
> 3) makes the memory enter its (stateful) 4-byte address mode, if needed,
>    for SPI flash memory > 128Mbits not supporting the 4-byte address
>    instruction set.
> 
> spi_nor_scan() now ends by calling spi_nor_init() once the probe phase has
> completed. Further patches could also use spi_nor_init() to implement the
> mtd->_resume() handler for the spi-nor framework.
> 
> Signed-off-by: Kamal Dasu <kdasu.kdev at gmail.com>
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen at atmel.com>

Applied to github/spi-nor